Rinse arm connection



May 5, 1953 G. B. Fox Er AL 2,637,595

RINSE ARM CONNECTION Filed oct. 3, 194e arm. The pin has a rinse uidsupply passage I5 extending axially therethrough. The wash arm isindicated at I8 and has a hub portion I9 in which there is press-fitteda bronze or other suitable bearing member having a shoulder 2I on whichthe hub portion is seated. The wash arm is provided with a series ofdischarge slots or apertures 23 one or more of which are suitablyinclined to effect rotation of the wash arm by reaction when the fluidis supplied thereto.

The upper end of pin I3 is threaded on its interior. An upper bearingpin 24 also having a hollow axial passage 25 is threadedly received inthe upper end of pin I3, and a hardened and ground stainless steelwasher 26 is received between a shouldered portion of pin 24 and pin I3and held in place thereby to provide a thrust surface for engagementwith the upper end of the bearing member 20, providing for taking theupward thrust of the wash arm which occurs during use and under thesupply of iiuid pressure thereto. The central passage 25 of pin 24connects with the passage I5 of pin I3 and with the horizontallyextending passages 28 which in turn communicate with the hollow interior38 of the rinse arm hub 3|.

The rinse arm assembly comprises the hub or body portion 3l and rinsepipes 32 and 33 which are removably secured therein, the hub 3I beingadapted to be slidably received over the end of the upper bearing pin24.

This hub is formed as shown in Fig. 4 and has upper and lower bearingsleeves 34 and 35 secured therein in which the upper bearing pin 24 isreceived. These sleeves are separated from each other providing theannular passage 35 which communicates with the interior of the rinsepipes through passages 31 and 38 and is adapted to align with thepassages 28 in pin 24 when the rinse arm is in operating positionthereon. Closing the top of the hub is a pivot bearing plate 39 which isfastened thereto by means of the screws 40, the center thereof beingadapted to engage ov er a truncated conical tip 4I formed on the upperend of bearing pin 24 to provide a thrust bearing for the rinse armassembly. Such construction limits the downward travel of the hub 3I andmaintains it in position for free rotation about pin 24 in spacedrelation with the thrust washer 26, and completely out of contact withall portions of the wash arm.

Rinse pipes 32 and 33 are provided with discharge nozzles 42 throughwhich the rinse water is discharged during use, the reaction causing therinse arm to rotate in a direction opposite to the rotation of the washarm. These pipes are constructed of brass tubing or other suitable metalandfhave the outer ends thereof threaded to receive a screw plug 43which is removable, but which cannot be entirely separated from therinse pipe since its movement is limited by the extent to which theretainer 44 attached thereto is limited in its movement.

This construction thus provides a quickly demountable rinse armcomprising a separate and easily removable rotatable hub adapted toreceive a supply of rinse liquid and having a rinse pipe operablyreceived by a sliding engagement with the hub, interfitting partsbetween the hub and each of the rinse pipes providing for a directconnection.

A retaining clamp 45 as shown in Fig. 3 is secured to the inner end ofeach rinse pipe.

lock the clamp in place on the rinse pipe.

This clamp is formed with a reamed center bore 46 adapted to slidablyreceive the rinse pipe, and with bifurcated ends 41, 48, and 49, 50.

rPhe end 41, having a central bore extending therethrough, and end 48,similarly bored and threaded, are spaced slightly apart to receive aheaded screw 52 which can be tightened down to The clamp is mounted onthe inner end of each rinse pipe so as to permit the end of the pipe toproject therefrom as shown in Fig. 2. Pipes 32 and 33 each have theirinner ends adapted to intert with the passages 31 and 38 respectively toprovide a direct connection between the hub and the pipes when the endsof the pipes are inserted therein so that the clamp abuts against thehub, the passages 31 and 38 thus forming sockets for receiving the endof the pipes. The ends 49 and 50 of the clamp are spaced apartsuiiiciently to receive the looped end of the retaining spring 53therebetween, and are also bored so that a retaining pin 54 may beinserted through the looped end of the spring to hold it in position.The end of this pin is drilled as at 55 to receive a cotter pin 56 whichprevents the pin from working out of position.

Attached to each retaining clamp is a deiiector plate or vane 60 whichis formed from a fiat piece of stainless steel. At one side thereof apair of holes are drilled so that each vane can be retained in positionon the retaining clamp by inserting the headed screw 52 and the pin 54therethrough. Each vane is also provided with an extended wing surfaceor portion 62 inclined as illustrated in Figs. l and 3, which has properradial dimensions so that it is in position to intercept a portion ofthe wash liquid discharged from the innermost apertures in the wash arm.

'lo permit the rinse pipes .'52 and 33 to be assembled in operatingposition quickly and easily, and

to permit them to be readily removed independently of each other, ifdesired, for inspection and cleaning and without requiring the use oftools or skilled labor, the fiat retaining spring 53 formed of bronze(spring stock) and shaped as shown in Fig. 2 is provided. This springwhich has a loop formed in one end through which pin 54 is inserted, aspreviously described, has a hook portion formed therein adapted to belatched over the shoulder 66 formed on the hub 3 I. Thus by snapping thehook over the shoulder the rinse pipes are securely held in operatingposition in the hub and can be removed by merely releasing the spring,as illustrated by the rinse pipe viewed on the left side of Fig. 2 whichhas thus been removed.

In order to provide that the rinse pipes cannot be reassembled, afterhaving been removed for inspection or cleaning, except by replacing themin the proper position to operate correctly, that is, assembled inproper angular relationship assuring proper direction of discharge offiuid from the discharge means in the rinse pipes, on the exterior ofthe hub 3| adjacent the outer ends of passages 31 and 38 shoulders 16are formed in which the grooves 12 are cut. These grooves are of sucientwidth and depth to receive the retaining spring 53 when it is in theclosed position and thus provide means for guiding the rinse pipes intoproper operating alignment. This will be apparent when it is noted thatthe hook portion 65 of the spring 53 cannot be latched over the shoulder66 on the hub to secure the rinse pipes to the hub unless the rinsepipes are so positioned that the spring is seated within the groove i2.

It is to be noted in connection with the assembly of the rinse pipesthat the vanes 60, being mounted on the retaining clamps, are removed orcarried as a part of the clamps and thus remain attached to the rinsepipes when such pipes are removed from the hub. This constructionprovides for ready inspection and cleaning of the vanes, as well as therinse pipes, without the necessity of using tools to remove them fromthe machine and also prevents the loss or misplacement of such parts,the whole assembly being effected with only a few parts and a minimum cilabor. It is aiso impossibile because of this arrangement to reassemblcvanes except in the proper position since they are mounted and carriedas a part of the rinse arm assembly.

In operation the rinse liquid is supplied through the interior of stemi3, and through the communicating passages 25 and 28 in pin to bedischarged into annular space 35 and passages 31 and iid in the hub 3i,and from there into the respective rinse pipes for discharge therefrom.

During supply of wash iiuid to the wash arm, and the consequent rotationof the wash arm, fluid will se projected from the wash arms and willperiodically impinge upon the wing surfaces t2 ci the vanes and keep therinse arm from remaining in a :fixed position relative to the wash armwhere it would interfere with the wash sprays.

While the form of apparatus herein described constitutes a preferredembodiment of the invention, it is to he understood that the inventionis not limited to this precise form of apparatus, and that changes mayhe made therein without departing irom the scope oi the invention whichis donned in the appended claims.

What is claimed is:

l. In a dishwasher of the character described having a Wash arm mountedfor rotation therein and including a hollow huh mounted for rotationwith respect to said wash arm and adapted to receive rinse iiuid from asource thereof, said hub having an open socket in side communicatingwith the interior thereof, and a rinse pipe adapted at one end thereoffor connection with said socket and having discharge outlets along oneside thereof, the combination of quickly demountable attaching means forsaid rinse pipe adapted to establish and maintain a predeterminedangular relationship of said pipe in said socket wherein said pipeoutlets discharge said rinse uid in a predetermined direction providinga reaction causing rotation of said hub While at the same time impingingon the articles within said dishwasher at effective rinse angles, saidmeans comprising an elongated resilient latch on said pipe adapted toextend a substantial distance exteriorly of said hub beyond the outerend of said socket, a shoulder on said hub forming a keeper adapted forlatching engagement with said latch, and means on the exterior of saidhub intermediate said shoulder and the outer end of said socket forpreventing latching engagement of said latch with said shoulder exceptwhen said pipe is in said predetermined angular relationship in saidsocket assuring said predetermined direction of discharge of said rinsefluid from said pipe outlets.

2. In a dishwasher of the character described including a wash armmounted for rotation therein, and a hub mounted for rotation withrespect to said wash arm and having a passage therein for receivingrinse fluid from a source thereof, the combination of means on said hubdefining a pair of sockets extending into said hub in laterally offsetopposite directions, means connecting the inner ends of said socketswith said passage, a pair of rinse pipes each having one end thereofformed to be received in one of said sockets, said rinse pipes havingdischarge outlets along one side of each thereof for discharging saidrinse fluid, a latch on each said pipe, a pair of shoulders on theexterior of said hub each associated with one oi said sockets and spacedfrom the outer end of said associated socket to form a keeper for saidlatch on the associated said rinse pipe, and abutment means on said hubintermediate each said associated shoulder and socket for preventingengagement of said latch with said shoulder except when said pipe is ina predetermined angular position in said socket assuring discharge ofsaid rinse iiuid from said pipe outlets in a predetermined directionproviding a reaction causing rotation of said hub while at the same timeimpinging on the articles in said dishwasher at effective rinse angles.

3. In a dishwasher of the character described including a wash armmounted for rotation therein and a generaliy hollow hub mounted forrotation with respect to said wash arm and adapted to receive rinsefluid from a source thereof, the combination of means forming a socketextending into the interior of said hub, a rinse pipe having dischargeoutlets along one side thereof and adapted at one end thereof forinsertion in said socket, a collar on said pipe adjacent said one endthereof and adapted to abut the outer end of said socket forming meansto limit insertion of said pipe end in said socket, a latch member onsaid collar, means on said hub forming a keeper for said latch memberspaced from said socket and adapted for cooperation with said latchmember to retain said pipe in connected relation with said hub, andabutment means on said hub between said keeper and the outer end of saidsocket for guiding said latch into latching engagement with said keepertherefor only when said pipe is in a predetermined angular position insaid socket assuring discharge of said rinse iiuid from said pipeoutlets in a predetermined angular direction providing a reactioncausing rotation of said hub While at the same time impinging on thearticles in said dishwasher at eiTective rinse angles.

GERALD B. FOX. DEWEY B. DICKHART.

References Cited in the le of this patent UNITED STATES PATENTS NumberName Date 909,131 Antic Jan. 12, 1909 1,151,254 Enghauser Aug. 24, 19151,487,517 Krause Mar. 18, 1924 2,004,967 Williams June 18, 19352,286,203 Fox June 16, 1942 2,380,059 Meeker July 10, 1945 2,380,090Wallace July 10, 1945

